多线程编程(3)：线程池ThreadPool

using System.Threading; 
using System.Collections; 
using System.Diagnostics; 
using System; 
using System.ComponentModel; 
 
namespace ThreadPoolDemo 
{ 
         class ThreadPoolDemo1 
        { 
                 public ThreadPoolDemo1() 
                { 
                } 
 
                 public  void Work() 
                { 
                        ThreadPool.QueueUserWorkItem( new WaitCallback(CountProcess)); 
                        ThreadPool.QueueUserWorkItem( new WaitCallback(GetEnvironmentVariables)); 
                } 
                 /// <summary> 
                 /// 统计当前正在运行的系统进程信息 
                 /// </summary> 
                 /// <param name="state"></param> 
                 private  void CountProcess( object state) 
                { 
                        Process[] processes = Process.GetProcesses(); 
                         foreach (Process p  in processes) 
                        { 
                                 try 
                                { 
                                        Console.WriteLine( "Id:{0},ProcessName:{1},StartTime:{2}", p.Id, p.ProcessName, p.StartTime); 
                                } 
                                 catch (Win32Exception e) 
                                { 
                                        Console.WriteLine( "ProcessName:{0}", p.ProcessName); 
                                } 
                                 finally 
                                { 
                                } 
                        } 
                        Console.WriteLine( "获取进程信息完毕。"); 
                } 
                 /// <summary> 
                 /// 获取当前机器系统变量设置 
                 /// </summary> 
                 /// <param name="state"></param> 
                 public  void GetEnvironmentVariables( object state) 
                { 
                        IDictionary list=System.Environment.GetEnvironmentVariables(); 
                         foreach (DictionaryEntry item  in list) 
                        { 
                                Console.WriteLine( "key={0},value={1}", item.Key, item.Value); 
                        } 
                        Console.WriteLine( "获取系统变量信息完毕。"); 
                } 
 
   static  void Main( string[] args) 
                { 
                        ThreadPoolDemo1 tpd1 =  new ThreadPoolDemo1(); 
                        tpd1.Work(); 
                        Thread.Sleep(5000); 
 
                        Console.WriteLine( "OK"); 
 
                        Console.ReadLine(); 
                } 
        } 
}